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<div about="/news-events/nih-research-matters/predicting-response-immunotherapy" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2018-09-11T00:00:00-04:00" class="date-display-single">September 11, 2018</span></p><div class='syndicate'><h1>Predicting response to immunotherapy</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul>
<li>Three research teams working independently found that they may be able to predict which patients are most likely to respond to certain cancer treatments known as immune checkpoint therapies.</li>
<li>These approaches may lead to lab tests that can help guide treatment decisions.</li>
</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
<picture title="Illustration of T cells attacking cancer cells">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2018/20180911-therapy.jpg?itok=WUBhfcKU&amp;timestamp=1536605922 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2018/20180911-therapy.jpg?itok=PKtsUmvY&amp;timestamp=1536605922 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2018/20180911-therapy.jpg?itok=kgt8uVtm&amp;timestamp=1536605922" alt="Illustration of T cells attacking cancer cells" title="Illustration of T cells attacking cancer cells" />
</picture><span class="caption">Immune system T cells (red) often attack cancer cells, but some cancer cells release proteins to halt the assault. </span><span class="credit">Meletios Verras/iStock/Thinkstock</span></div>
</div><p>More than 90,000 people nationwide will be diagnosed with melanoma in 2018. Melanoma is the most serious type of skin cancer. If not removed, it can invade nearby tissues and spread throughout the body. After cancer spreads, its much harder to treat.</p>
<p>Some cancer cells make proteins that keep the immune system response against them in check. Immune checkpoint therapy is a new treatment option that reverses this block and helps the immune system fight cancer. The treatment is used for people with melanoma and certain other cancers. However, only some people with melanoma are helped by this immunotherapy. If there were a way to predict which people would not respond to therapy, then they could be spared the treatment and its side effects.</p>
<p>Three independent research teams recently reported developing ways to predict which melanoma patients are most likely to respond to checkpoint therapy. The work was funded in part by several NIH components. Two papers were published in <em>Nature Medicine</em> on August 20, 2018, and another in <em>Nature</em> on August 8, 2018.</p>
<p>A team led by Drs. Eytan Ruppin and Noam Auslander of NIHs National Cancer Institute (NCI) devised a method of predicting treatment response in melanoma tumor samples. They created their predictor by analyzing the unique gene expression features of cancer patients whod had a spontaneous immune response that caused their tumor to shrink. These features enabled the researchers to compute what they called an immuno-predictive score for each patients tumor sample. The higher the score for a sample, the more likely the patients tumor was to undergo spontaneous shrinkage.</p>
<p>The researchers tested their predictor on 297 tumor samples from melanoma patients. The predictor could identify nearly all patients who responded to checkpoint therapies and more than half of those who didnt, making it significantly better than other published predictors. Notably, the predictor was accurate when they tested it with many different melanoma patient datasets.</p>
<p>A team led by Drs. Kai W. Wucherpfennig and X. Shirley Liu of Harvard University also used unique gene expression features of tumors to create a predictor. They focused on features that predict which tumors would escape destruction by the immune system. Their computational model used data from 33,000 tumor samples collected in 189 studies.</p>
<p>To test the model, the team used publicly available data on the outcome of melanoma patients after checkpoint therapy. They reported that their predictor was also better than others previously published in the literature.</p>
<p>A team led by Drs. Wei Guo and Xiaowei Xu of the University of Pennsylvania used blood samples rather than tumor samples for their predictor. Blood samples are far easier to acquire from patients. Cells can release tiny sacs known as exosomes to carry proteins or other substances through the bloodstream or other body fluids. Molecules on the surface enable exosomes to find target cells. Past studies have shown that exosomes can worsen disease by inhibiting immune cells.</p>
<p>The team found that metastatic melanomas release exosomes that carry programmed death ligand 1 (PD-L1) on their surfaces. Exosomes with PD-L1 attach to the PD-1 receptor on T cells, a type of immune cell. This interaction turns off the cancer-fighting T cell. The teams analysis showed that people with higher levels of exosomal PD-L1 before anti-PD-1 checkpoint therapy were less likely to respond to the treatment.</p>
<p>With further development using more patient data, these methods could help doctors predict which melanoma patients are most likely to respond to checkpoint therapies. The approaches might also be combined to make even better predictions.</p>
<p>“There is a critical need to be able to predict how cancer patients will respond to this type of immunotherapy,” Ruppin says. “Being able to predict who is highly likely to respond and who isnt will enable us to more accurately and precisely guide patients treatment.”</p>
<p>—by Geri Piazza</p></div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/biomarkers-early-organ-transplant-rejection" target="_top">Biomarkers for Early Organ Transplant Rejection</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/method-early-detection-pancreatic-cancer" target="_top">Method for Early Detection of Pancreatic Cancer</a></li><li><a href="https://www.cancer.gov/news-events/cancer-currents-blog/2018/exosomes-tumors-evade-immune-system" target="_top">Exosomes May Help Tumors Evade Immune System</a></li><li><a href="https://www.cancer.gov/about-cancer/diagnosis-staging/research/exosomes" target="_top">Seeking Cancer Clues in Blood, Researchers Explore Exosomes</a></li><li><a href="https://www.cancer.gov/about-cancer/treatment/types/immunotherapy" target="_top">Immunotherapy to Treat Cancer</a></li><li><a href="https://www.cancer.gov/types/skin/patient/melanoma-treatment-pdq" target="_top">Melanoma Treatment</a></li><li><a href="https://seer.cancer.gov/statfacts/html/melan.html" target="_top">Cancer Stat Facts: Melanoma of the Skin</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/30127394">Robust prediction of response to immune checkpoint blockade therapy in metastatic melanoma</a>. Auslander N, Zhang G, Lee JS, Frederick DT, Miao B, Moll T, Tian T, Wei Z, Madan S, Sullivan RJ, Boland G, Flaherty K, Herlyn M, Ruppin E. <em>Nat Med</em>. 2018 Aug 20. doi: 10.1038/s41591-018-0157-9. [Epub ahead of print]. PMID: 30127394.<br /><br />
<a href="https://www.ncbi.nlm.nih.gov/pubmed/30127393">Signatures of T cell dysfunction and exclusion predict cancer immunotherapy response</a>. Jiang P, Gu S, Pan D, Fu J, Sahu A, Hu X, Li Z, Traugh N, Bu X, Li B, Liu J, Freeman GJ, Brown MA, Wucherpfennig KW, Liu XS. <em>Nat Med</em>. 2018 Aug 20. doi: 10.1038/s41591-018-0136-1. [Epub ahead of print]. PMID: 30127393.<br /><br />
<a href="https://www.ncbi.nlm.nih.gov/pubmed/30089911">Exosomal PD-L1 contributes to immunosuppression and is associated with anti-PD-1 response</a>. Chen G, Huang AC, Zhang W, Zhang G, Wu M, Xu W, Yu Z, Yang J, Wang B, Sun H, Xia H, Man Q, Zhong W, Antelo LF, Wu B, Xiong X, Liu X, Guan L, Li T, Liu S, Yang R, Lu Y, Dong L, McGettigan S, Somasundaram R, Radhakrishnan R, Mills G, Lu Y, Kim J, Chen YH, Dong H, Zhao Y, Karakousis GC, Mitchell TC, Schuchter LM, Herlyn M, Wherry EJ, Xu X, Guo W. <em>Nature</em>. 2018 Aug 8. doi: 10.1038/s41586-018-0392-8. [Epub ahead of print]. PMID: 30089911.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs National Institute of General Medical Sciences (NIGMS), National Institute of Allergy and Infectious Diseases (NIAID), and National Cancer Institute (NCI); NCIUMD Partnership for Integrative Cancer Research; Israeli Science Foundation; Parker Institute for Cancer Immunotherapy; American Heart Association; Tara Miller Foundation; University of Pennsylvania; Wistar Institute; Dr. Miriam and Sheldon G. Adelson Medical Research Foundation; China Association for Science and Technology; National Natural Science Foundation of China; and Breast Cancer Research Foundation.</p>
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